Managing Drug Supply (MDS) is the leading reference on how to manage essential medicines in developing countries. MDS was originally published in 1982; it was revised in 1997 with over 10,000 copies distributed in over 60 countries worldwide. The third edition, MDS-3: Managing Access to Medicines and Health Technologies reflects the dramatic changes in politics and public health priorities, advances in science and medicine, greater focus on health care systems, increased donor funding, and the advent of information technology that have profoundly affected access to essential medicines over the past 14 years. Nearly 100 experts from a wide range of disciplines and virtually every corner of the world have contributed to this third edition. In addition to many new country studies, references, and extensive revisions, MDS-3 offers new chapters on areas such as pharmaceutical benefits in insurance programs, pricing, intellectual property, drug seller initiatives, and traditional and complementary medicine. The revisions and new chapters echo the wide variety of issues that are important to health practitioners and policy makers today. MDS-3 will be a valuable tool in the effort to ensure universal access to quality medicines and health technologies and their appropriate use.